I have PDF-XChange Editor version 6. I have several hundred text boxes/fields i need to create and I can't figure out how to made the default text (text that will be filled in the box) to be bold when I create the text box. Default text format properties are Font, Size, Color. Any suggestions?

To save changes to the text style, you need only use the Set As default button on the properties toolbar. As for bold, it should be seen as a Capital B also on the properties toolbar, see screenshot below: